Skip the auto shop - Our mechanics make house calls

Q: My car is showing two trouble codes: P1639 and PO452

asked by on

Need to repair the two codes PO452 and P1639 in order to pass emissions

My car has 81000 miles.
My car has an automatic transmission.

A: Hello. The diagnostic codes you are receivi...

Hello. The diagnostic codes you are receiving may be a result of both sensors failing, or a power supply issue. The code P1639 stands for an A/C refrigerant pressure sensor voltage shortage. The second code P0452 stands for the fuel tank pressure sensor voltage shortage. While it’s possible that both sensors can fail at once, it’s also possible the voltage references are being disturbed. You can attempt to replace the fuel pressure sensor and refrigerant pressure sensor and see if the codes go away. You can also trace the voltage with a voltmeter in order to find where the voltage drop occurs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car doesn't shift out of park.

Does the shifter move out of park? If the shifter moves but the car does not come out of park something has broken in your shifter. If you can not move the shifter out of park there is a problem...

Q: Car wont start after driving

Hi There, Based upon what you are describing, it sounds like you may have an ignition coil that may be starting to fail. Ignition coils are exceptionally susceptible to problems with large temperature fluctuations when they are beginning to fail...

Q: Rear right wheel locks after driving 3-4 feet.

Hi there. From the description you have provided, leads me to believe the emergency/parking brake may be partially applied. This would account for being able to move in reverse and only a few feet forward. It could be, the parking...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.